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| 1 | 分子马达 构建“小”的世界显示文摘科普便利贴:机体的一切活动,从肌肉收缩、细胞内部的运输、遗传物质(DNA)的复制,到细胞的分裂等等,在分子水平上,都是具有马达功能的蛋白质大分子做功推动的结果。因此,它们被称为分子马达或蛋白质马达、蛋白质机器等。到目前为止,已有百种以上的分子马达被确定,它们在机体内执行着各种各样的生物功能。分子马达都是沿着相应的蛋白丝做定向运动。这些蛋白丝起着'轨道'的作用,它们都是有极性的,因而也是有方向性的。这些分子马达可高效率地将贮藏在腺苷三磷酸(ATP)分子中的化学能直接转换为机械能,产生协调的定向运动而做功。迄今为止,人类尚无由化学能直接转换为机械能做功的任何记载,因而由生物体反映出的这种独特的能量转换形式不仅对于生命活动至关重要,而且人类也可以从新的角度出发去认识、研究及利用这种能量转换的分子机制。因此,分子马达做功原理及能量转换机制一直是分子生物学、物理学、生物化学等诸多学科中最为引人注目的领域之一,并且会在相当长的时间里成为多学科共同面临的一个极具挑战性的科学领域。 | Ben L.FERINGA 柳华杰 | 2008 | 创新科技2008，，10： | 0 |
| 2 | Photo-responsive functional materials based on light-driven molecular motors显示文摘In the past two decades,the research and development of light-triggered molecular machines have mainly focused on developing molecular devices at the nanoscale.A key scientific issue in the field is how to amplify the controlled motion of molecules at the nanoscale along multiple length scales,such as the mesoscopic or the macroscopic scale,or in a more practical perspective,how to convert molecular motion into changes of properties of a macroscopic material.Light-driven molecular motors are able to perform repetitive unidirectional rotation upon irradiation,which offers unique opportunities for responsive macroscopic systems.With several reviews that focus on the design,synthesis and operation of the motors at the nanoscale,photo-responsive macroscopic materials based on light-driven molecular motors have not been comprehensively summarized.In the present review,we first discuss the strategy of confining absolute molecular rotation into relative rotation by grafting motors on surfaces.Secondly,examples of self-assemble motors in supramolecular polymers with high internal order are illustrated.Moreover,we will focus on building of motors in a covalently linked system such as polymeric gels and polymeric liquid crystals to generate complex responsive functions.Finally,a perspective toward future developments and opportunities is given.This review helps us getting a more and more clear picture and understanding on how complex movement can be programmed in light-responsive systems and how man-made adaptive materials can be invented,which can serve as an important guideline for further design of complex and advanced responsive materials. | Yanping Deng Guiying Long Yang Zhang Wei Zhao Guofu Zhou Ben L.Feringa Jiawen Chen | 2024 | Light(Science & Applications)2024，13，3： | 0 |
| 3 | Scale effect of circularly polarized luminescent signal of matter显示文摘Circularly polarized luminescence(CPL)is an important part in the research of modern luminescent materials and photoelectric devices.Usually,chiral molecules or chiral structures are the key factors to induce CPL spontaneous emission.In this study,a scale-effect model based on scalar theory was proposed to better understand the CPL signal of luminescent materials.Besides chiral structures being able to induce CPL,achiral ordered structures can also have a significant influence on CPL signals.These achiral structures are mainly reflected in the particle scale in micro-order or macro-order,i.e.the CPL signal measured under most conditions depends on the scale of the ordered medium,and does not reflect the inherent chirality of the excited state of the luminescent molecule.This kind of influence is difficult to be eliminated by simple and univers al strategies in macro-measurement.At the same time,it is found that the measurement entropy of CPL detection may be the key factor to determine the isotropy and anisotropy of the CPL signal.This discovery would bring new opportunities to the research of chiral luminescent materials.This strategy can also greatly reduce the development difficulty of CPL materials and show high application potential in biomedical,photoelectric information and other fields. | Siyu Sun Xiaolin Li Chen Xu Yan Li YongZhen Wu Ben L.Feringa He Tian Xiang Ma | 2023 | National Science Review2023，10，5： | 0 |
| 4 | Mechanistic Insight into Supramolecular Polymerization in Water Tunable by Molecular Geometry显示文摘Supramolecular self-assembly in water based on non-covalent bonding is attracting major attention due to the potential of hydrogels and aqueous polymers in biomedical applications.Although supramolecular polymerization in organic solvents is well established,the key design features,the assembly mechanisms in water and achieving control over the aggregate structures remain challenging.Here,we present the assembly and disassembly of geometrical isomers of a stiff-stilbene bis-urea amphiphile(SA)in pure water.A remarkable feature of this system is that the(E)-isomer forms supramolecular polymers in both pure water and organic solvents.Taking advantage of this unique property,the hydrophobic effect was studied by comparing the supramolecular assembly in both systems.The assembly process inwater follows an enthalpy-driven nucleation-elongation(cooperative)supramolecular polymerization mechanism with a standard Gibbs free energy(ΔG°=−53 kJ mol^(−1))double the value of the one found in toluene.We attributed this distinctive feature to the hydrophobic effect in water.Furthermore,we discovered an isomer-dependent assembly process,which can be used to control aggregation in aqueous media.Due to the substantial geometric difference between(E)-SA and(Z)-SA,we compared their assembly in water to study the influence of different driving forces involved in the process.The supramolecular polymerization of(E)-SA was cooperatively influenced by hydrogen bonding,π-stacking,and hydrophobic effects,whereas the assembly of(Z)-SAwasmainly driven by hydrophobic effects.As a result,the fiber length of(E)-SA in water is much longer than that of(Z)-SA,presenting opportunities for geometrical control of aggregation in aqueousmedia. | Fan Xu Stefano Crespi Lukas Pfeifer Marc C.A.Stuart Ben L.Feringa | 2022 | CCS Chemistry2022，4，7： | 0 |
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